Made with 60g Polartec® Alpha®, the first-ever breathable puffy insulation for active warmth, the Alpha Mid Jacket is designed to provide the warmth-without-weight and weather resistance of a light puffy, with the breathability of a midlayer for comfort throughout a wide range of conditions. Polartec® Alpha® was developed for U.S. Special Operations Forces and is now available through Strafe. Unlike down or classic synthetic fill, which require the use of “closed” fabrics, Polartec® Alpha® is a highly stable insulation that won’t poke through or migrate. This allows us to create an air permeable puffy insulation package for the AP Mid Jacket that’s not a vapor barrier, rather one that breathes with you for active warmth. It also dries dramatically faster than other puffy insulations and is remarkably lightweight and compressible.